Once you fix the headers, you can test them by typing in a letter or number in one header and scrolling through the pages to make sure it shows up on all the pages. Do this for each section that you have given its own page (Ugh!).
Click it to link the current header to the previous header. The design tab (of the ribbon) should have the focus and you should see a navigation pane with a “link to previous” option. Double click on the header to go into the edit header/footer mode. Once each section is on its own page, we can edit the header (or footer) for that section. After each section break we will need to insert a new page (Ctrl-Enter for shortcut). We need to link each header from each section back to the original header (or footer).
